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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        var arr = [2, 6, 1, 77, 52, 25, 7];

        var max = arr[0];

        for(var i = 1; i < arr.length; i++)
        {
            if(arr[i] > max)
            {
                max = arr[i];
            }
        }
        console.log("数组中最大的值是： " + max);

        var min = arr[0];

        for(var j = i; j < arr.length; j++)
        {
            if(arr[i] < min)
            {
                min = arr[j];
            }
        }
        console.log("数组中都最小值是"+min);
    </script>
</body>
</html>